Hitachi Chemical Dupont Microsystems, Ltd.

Hitachi Chemical Company, Ltd.

Yuichi Kaneya

Toshiaki Tanaka

Keiko Suzuki

Toshiaki Itabashi

Yumiko Arakawa

The polyimide precursor composition of the present invention is characterized in comprising a polyimide precursor having a structure formed by reacting a diamine component (A) containing a fluorine-containing aromatic diamine (a1) represented by the following chemical formula (I) (in the formula (I), Rand Rare each independently selected from &#x2014;H, &#x2014;(CF)&#x2014;CF, and &#x2014;O(CF)&#x2014;CF(n is an integer of 0 or more and 7 or less), and at least one of Rand Ris a fluorine-containing group) and trans-1,4-cyclohexyldiamine (a2) with an acid dianhydride component (B) containing an aliphatic tetracarboxylic dianhydride (b1) and an aromatic tetracarboxylic dianhydride (b2). Use of the composition of the present invention provides a polyimide film and a transparent flexible film having high transparency, low thermal expansion properties, low birefringent properties, and high heat resistance.

Polyimide precursor composition, polyimide film, and transparent flexible film

A circuit connection structure that exhibits excellent adhesiveness between a heat resistant resin film and a circuit adhesive member, even under high temperature and high humidity, is provided by introducing a chemically stable functional group into the heat resistant resin film by additional surface treatment to improve adhesiveness. In a circuit connection structure, a semiconductor substrate and a circuit member are adhered by a circuit adhesive member sandwiched therewith. First circuit electrode on the semiconductor substrate and second circuit electrode on the circuit member are connected electrically by conductive particles in the circuit adhesive member. A surface modification is given to the semiconductor substrate by plasma treatment using gas containing nitrogen, ammonia and the like. Therefore, the heat resistant resin film on the semiconductor substrate and the circuit adhesive member are firmly adhered for a long period of time even under high temperature and high humidity.

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Hitachi, Japan

Yuichi Kaneya